| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a rapid decrease in brake fluid pressure to be suppressed and rapid increase in pedal pressure to be relieved when power source voltage to an electric actuator is reduced during braking operation due to the failure of a vehicle power source. <P>SOLUTION: There is included an electric booster brake device 6 that detects a pedal operation amount by a driver and makes a master cylinder 68 generate a brake fluid pressure boosted by assist controlling a booster motor 24. The electric brake control system includes a power source voltage detecting circuit 10 and a controller 21. The power source voltage detecting circuit 10 detects the power source voltage of the vehicle power source 1. The controller 21 controls the booster motor 24 (Fig.4) so as to gradually reduce a brake fluid pressure during time from when the detected power source voltage V becomes a low voltage determination reference value V1 to when the same becomes the lowest operating voltage value V0 in which a booster function stops when the power source voltage V to the booster motor 24 is reduced during the braking operation due to the failure of the vehicle power source 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
